Answer:
The age of Jenny's mom is 40 % of age of Jenny's great-grandmother. (Input: 40)
Step-by-step explanation:
The percentage needed is calculated by the following expression:

Where:
- Percentage of Jenny's mother with respect to Jenny's great-grandmother, measured in percentage.
- Age of Jenny's mother, measured in years.
- Age of Jenny's great-grandmother, measured in years.
If we know that
and
, the percentage is:


The age of Jenny's mom is 40 % of age of Jenny's great-grandmother.
Sum means addition so the equation is x+5=14
To get the answer, just do 14-5 and the answer is 9
The scale factor of 4 was applied to the first triangle. 6 was divided by 4 to get 1.5